Dharmadhikari, J. A. ; Dharmadhikari, A. K. ; Bhatnagar, A. ; Mallik, A. ; Chandrakanta Singh, P. ; Dhaman, Reji K. ; Chalapathi, K. ; Mathur, D. (2011) Writing low-loss waveguides in borosilicate (BK7) glass with a low-repetition-rate femtosecond laser Optics Communications, 284 (2). pp. 630-634. ISSN 0030-4018
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.optcom.2010.09.055
Abstract
Borosilicate glass (BK7) is a widely-used material in integrated optics devices and in the optical communications industry. We report on laser-written waveguiding in BK7 glass using a low-repetition-rate (1 kHz) laser producing 40 fs pulses of 800 nm light. A 500 μm slit is used to write structures 100 μ m below the glass surface. These waveguides show strong guidance at 635 nm, with an index contrast of 3 × 10-4 and a propagation loss of ~ 0.5 dB/cm. We measured the change in refractive index for a range of writing conditions as quantified in terms of energy dose; there is an energy dose window (> 0.6 μJ μm-3 and < 1.5 μJ μm-3) within which the written structures show guidance.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Waveguide Writing; Ultrafast Laser; Femtosecond Laser Writing; Material Modification; Borosilicate Glass; Energy Dose Window |
| ID Code: | 77625 |
| Deposited On: | 14 Jan 2012 04:27 |
| Last Modified: | 14 Jan 2012 04:27 |
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